An electron accelerates between the cathode and the anode. It passes through a potential difference of 2000 v. The charge on an electron is 1.6 x 10-19 C and the mass of an electron is 9.1 x 10-31 kg. Find the following: A. Describe what is happening to the atoms in the screen as they are hit by electrons. B. State the kinetic energy, in eV, of the electron when it hits the screen. C. Calculate the work done on the electron passing through a pd of 2000 V. Give your answer in joules.
An electron accelerates between the cathode and the anode. It passes through a potential difference of 2000 v. The charge on an electron is 1.6 x 10-19 C and the mass of an electron is 9.1 x 10-31 kg. Find the following: A. Describe what is happening to the atoms in the screen as they are hit by electrons. B. State the kinetic energy, in eV, of the electron when it hits the screen. C. Calculate the work done on the electron passing through a pd of 2000 V. Give your answer in joules.
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Transcribed Image Text:An electron accelerates between the cathode and the anode. It
passes through a potential difference of 2000 v.
The charge on an electron is 1.6 × 10-19 C and the mass of an
electron is 9.1 x 10-31 kg. Find the following:
A. Describe what is happening to the atoms in the screen as
they are hit by electrons.
B. State the kinetic energy, in ev, of the electron when it
hits the screen.
C. Calculate the work done on the electron passing through a pd
of 2000 V. Give your answer in joules.
D. The work done on the electron becomes kinetic energy of the
electron. Write down the formula for kinetic energy in terms of
mass m and speed v.
E. Using your answers to questions 3 and 4, find the speed of
the electron.
F. The anode is connected to the screen. State and explain
what, if anything, happens to the speed of the electron as it
passes from the anode to the screen.
G. In 10 seconds, 6.0 × 10^17 electrons hit the screen.
Calculate:
(a) the charge hitting the screen in 10 seconds (the charge on
an electron is given above)
(b) the current in the electron beam.
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